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在光突发交换(OBS)网络中,突发包会由于竞争OBS核心节点输出端口的有限波长资源而发生冲突。突发包重传能够在一定程度上减少由于突发包在核心节点冲突而导致的数据损失,但重传次数的增加可能会加重网络负荷,反而增加数据丢失率。并且,在多业务存在的OBS网络中,重传方案需要能够实现区分服务以保证网络的服务质量(QoS)。据此,本文提出一种基于突发包优先级分割的可控重传方案,在实施优先级分割的同时,根据网络负荷赋予每次重传不同的概率,并对重传次数加以控制。最后,仿真分析了路径阻塞率和不同优先级业务的字节丢失率(ByLP,byte loss probability)性能。
In optical burst switching (OBS) networks, bursts collide because of the limited wavelength resources competing for the OBS core node output ports. Burst retransmission can reduce the data loss due to burst packet collision at the core node to a certain extent. However, the increase of retransmission times may increase the network load, but increase the data loss rate instead. And, in multi-service existing OBS networks, the retransmission scheme needs to be able to implement differentiated services to ensure the quality of service (QoS) of the network. Therefore, this paper proposes a controllable retransmission scheme based on the priority division of burst packets. At the same time, it implements different priority of retransmission according to the network load, and controls the retransmission times. Finally, the performance of the path loss rate and the byte loss probability (ByLP) of different priority services are analyzed by simulation.